On the role of different 2D materials/heterostructures in fiber-optic SPR humidity sensor in visible spectral region

Sharma, Anuj K.; Kaur, Baljinder; Popescu, V. A.

doi:10.1016/j.optmat.2020.109824

Cited by 26 publications

(9 citation statements)

References 27 publications

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“…High levels of humidity can cause respiratory irritation [ 168 ], especially if the patient suffers from chronic lung diseases such as chronic obstructive pulmonary disease (COPD) or asthma. The optical response of the sensor is proportional to the humidity released from the mouth, also proportional to the distance between the sensor head and the mouth opening.…”

Section: Discussionmentioning

confidence: 99%

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Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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Optical humidity sensors have evolved through decades of research and development, constantly adapting to new demands and challenges. The continuous growth is supported by the emergence of a variety of optical fibers and functional materials, in addition to the adaptation of different sensing mechanisms and optical techniques. This review attempts to cover the majority of optical humidity sensors reported to date, highlight trends in design and performance, and discuss the challenges of different applications.

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Section: Discussionmentioning

confidence: 99%

“…The dynamic range is 70%RH–95%RH. Anuj K. Sharma et al [ 168 ] explored 2D materials/heterostructure for SPR, with porous silica film-coated multimode fibers and angular light excitation (e.g., meridional and skew rays). It was found that the graphene variant exhibited the largest optical response.…”

Section: Literature and The State-of-the-artmentioning

confidence: 99%

Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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“…The reliable, ultrasensitive, and robust quantification of ambient relative humidity is highly desirable in numerous sectors related to our daily life, such as agriculture, smart homes, intelligent medical monitors, pharmaceuticals, and so on. 1 The humidity level in the respiration effectively reflects the human metabolism and health; 2 in fact, the extreme conditions of humidity are known to have adverse effects on human health and may be linked to several diseases. 3 Similarly, ambient relative humidity plays a pivotal role in photosynthesis, transpiration, and temperature regulations in plants.…”

Section: Introductionmentioning

confidence: 99%

Integrated Capacitive- and Resistive-Type Bimodal Relative Humidity Sensor Based on 5,10,15,20-Tetraphenylporphyrinatonickel(II) (TPPNi) and Zinc Oxide (ZnO) Nanocomposite

et al. 2022

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The development of high-performance humidity sensors to cater for a plethora of applications, ranging from agriculture to intelligent medical monitoring systems, calls for the selection of a reliable and ultrasensitive sensing material. A simplistic device architecture, robust quantification of ambient relative humidity (% RH), and compatibility with the contemporary integrated circuit technology make a bimodal (capacitive and resistive) surface-type sensor to be a prominent choice for device fabrication. Herein, we have proposed and demonstrated a facile realization of a 5,10,15,20-tetraphenylporphyrinatonickel (II)–zinc oxide (TPPNi-ZnO) nanocomposite-based bimodal surface-type % RH sensor. The TPPNi macromolecule and ZnO nanoparticles have been synthesized by an eco-benign microwave-assisted technique and a thermal-budget chemical precipitation method, respectively. It is speculated from the morpohological study that specific surface area improvement, via the provision of ZnO nanoparticles on micro-pyramidal structures of TPPNi, may reinforce the sensing properties of the fabricated humidity sensor. The relative humidity sensing capacitive and resistive characteristics of the sensor have been monitored in 40–85% relative humidity (% RH) bandwidth. The fabricated sensor under the biasing conditions of 1 V of applied bias ( V rms ) and 500 Hz AC test frequency exhibits a significantly higher sensitivity of 387.03 pF/% RH and 95.79 kΩ/% RH in bimodal operation. The average values of both the response and recovery times of the capacitive sensor have been estimated to be ∼30 s. It has also been debated why this high degree of sensitivity and considerable reduction in response/recovery time has been obtained. In addition, the intense and wide bandwidth spectral response of the TPPNi-ZnO nanocomposite indicates that it may also be utilized as a potential light-harvesting heterostructured nanohybrid in future studies.

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“…Besides, some metal oxide films are demonstrated to have the capability to enhance sensitivity [8,[12][13][14][15], or can even be used as the sensing layer by means of lossy mode resonance [16,17]. Moreover, 2D materials, such as graphene [18], molybdenum disulfide (MoS 2 ) [19], tungsten disulfide (WS 2 ) [20] and so forth, provide more choice and fascinating properties for SPR-based devices [20].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Enhanced Refractive Index Fiber Sensor Based on Long-Range Surface Plasmon Resonance in SiO2-Au-TiO2 Heterostructure

Shum

et al. 2021

Photonics

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Long-range surface plasmon resonance (LRSPR), generated from a coupled plasmon polariton in a thin metal slab sandwiched by two dielectrics, has attracted more and more attention due to its merits, such as longer propagation and deeper penetration than conventional single-interface surface plasmon resonance. Many useful applications related to light–medium interaction have been demonstrated based on the LRSPR effect, especially in the sensing area. Here, we propose and demonstrate an LRSPR-based refractive index sensor by using a SiO2-Au-TiO2 heterostructure, in which a D-shaped honeycomb-microstructure optical fiber (MOF) is designed as the silica substrate and then deposited with a gold film and thin-layer titanium dioxide (TiO2). By using the full-vector finite-element method (FEM), this heterostructure is numerically investigated and demonstrated to excite LRSPR without a buffer layer, which is usually necessary in previous LRSPR devices. Through comprehensive discussion about the influence of structural parameters on the resonant wavelength, the excitation of the LRSPR in the proposed heterostructure is revealed to be highly related to the effective refractive index of MOF’s fundamental core mode, which is mainly determined by the MOF’s pitch, the thicknesses of the silica web and the planar-layer silica. Moreover, the thin-layer TiO2 plays an important role in significantly enhancing the resonance and the sensitivity to analyte’s refractive index as well, when it is coated on the top of the Au film rather than between the metal and waveguide. Finally, the proposed LRSPR sensor based on SiO2-Au-TiO2 heterostructure shows an ultra-high wavelength sensitivity of 20,100 nm/RIU and the corresponding minimum resolution is as low as 4.98×10−7 RIU. Thus, the proposed LRSPR device offers considerable potential for sensing applications in biomedical and biochemical areas.

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On the role of different 2D materials/heterostructures in fiber-optic SPR humidity sensor in visible spectral region

Cited by 26 publications

References 27 publications

Review of Optical Humidity Sensors

Review of Optical Humidity Sensors

Integrated Capacitive- and Resistive-Type Bimodal Relative Humidity Sensor Based on 5,10,15,20-Tetraphenylporphyrinatonickel(II) (TPPNi) and Zinc Oxide (ZnO) Nanocomposite

Sensitivity Enhanced Refractive Index Fiber Sensor Based on Long-Range Surface Plasmon Resonance in SiO2-Au-TiO2 Heterostructure

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